Navegação Ciências Exatas e da Terra por Assunto "Compostos de cálcio"
Resultados 1-4 de 4
-
Effects of Ca and Sr chemical doping on the average superconducting kinetic energy of YBa2Cu3O7-δ
(2015) [Artigo de periódico]In this brief communication we applied the MZFC(T) and MFCC(T) reversible dc magnetizations to get the average superconducting kinetic energy density, kS(T,B) of YBa2Cu3O7-d, Y0.95Ca0.05Ba2Cu3O7-d and YBa1.75Sr0.25Cu3O7-d ... -
Hopping conductivity in one-dimensional Ca/sub 3/Co/sub 2/O/sub 6/ single crystals
(2002) [Artigo de periódico]We studied the electronic conductivity and magnetic properties of quasi-one-dimensional Ca₃Co₂O₆ single crystals. The results evidence a variable range hopping conductivity with temperature-induced crossover between ... -
Lattice dynamics and spin-phonon coupling in CaMn2O4 : a raman study
(2014) [Artigo de periódico]We present polarized Raman spectra of CaMn2O4 (marokite) measured in several exact scattering configurations from oriented single crystals. Most of the 11Ag + 12B1g + 10B2g + 9B3g Raman-allowed modes are identified and ... -
Separated suppression of the transverse and longitudinal Josephson flux mobility in a Bi/sub 1.6/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ superconductor
(2001) [Artigo de periódico]We report on very detailed zero-field-cooling and field-cooling magnetization and magnetoresistance measurements in a polycrystalline Bi₁.₆Pb₀.₄Sr₂Ca₂Cu₃Oy superconductor. The results allow us to study the irreversibility ...